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exam1_solution

# exam1_solution - ECE 321 Problem 1 Exam 1 Solution Spring...

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ECE 321 Exam 1 SolutionSpring 2006 Problem 1 Relative permeability is a dimensionless scaling factor, µ r , that indicates how permeable a material is with respect to free space, i.e. µ material µ r µ 0 = Problem 2 flux density: B (T or Wb/m^2) field intensity: H (At/m) Problem 3 Ferrimagnetic Problem 4 Hysteresis Problem 5 No. The mixed partials are not equal. i 2 λ 1 7 = i 1 λ 2 6 = (Problem 6) Ignore. Does not exist. Problem 7 Field energy Problem 8 L abs λ i = 20i 2 i = 20 = H L inc i λ = 40i = 40 = H Problem 9 T θ rm W c = 8 1 e i 1 i 2 + ( ) sin 4 θ rm ( ) = Problem 10 Step 1: i 2 0 = W 1 i 1 λ 1 d i 2 λ 2 d + = 0 i 1 i 1 5 i 1 10 1 x 2 + 1 e 5 i 1 + d = W 1 5i 1 2 2 10 1 x 2 + i 1 e 5 i 1 5 + i 1 0 = i 1 , + = 5i 1 2 2 10 1 x 2 + i 1 e 5 i 1 5 + 1 5 + = Step 2: i 1 constant =

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